Re: [PATCH 1/2] Btrfs: fix kernel oops while reading compressed data

David Sterba
2017-09-24T13:06:15Z

On Wed, Sep 20, 2017 at 05:50:18PM -0600, Liu Bo wrote:
> The kernel oops happens at
>
> kernel BUG at fs/btrfs/extent_io.c:2104!
> ...
> RIP: clean_io_failure+0x263/0x2a0 [btrfs]
>
> It's showing that read-repair code is using an improper mirror index.
> This is due to the fact that compression read's endio hasn't recorded
> the failed mirror index in %cb->orig_bio.

This sounds like the corner case of raid1 repair that was reported i the
past and actually is the only thing because of which we are not so
comfortable to mark raid1 'completely ok' in the Status page.